This is a Kit Kat clicker, like my Twix clicker, requires a 3 pin mechanical keyboard clicker for best results, but of course a 3D modeled clicker sized properly can work too.

the assembly is simple, but a little tight. I highly suggest that you put the clickers into the wrapper first, then the chocolate on the clickers. you might not experience the same problem, but when I assembled mine, I put the clickers on first, then put the chocolate into the wrapper with the clickers, but the holes are not centered perfectly, so I had to push a lot, and almost broke a clicker, so putting the clicker in the wrapper first  is what worked for me.